Don't eat in the classroom. 在教室里不要吃东西。Don't fight in the classroom.在教室里不要打架。Don't listen to music in the classroom.在教室里不要听音乐。Don't wear a hat in the classroom.在教室里不要戴帽子。Don't run in the classroom.在教室里不要跑动。Don't be noisy in the classroom.在教室里不要吵闹。Don't quarrel in the classroom.在教室里不要吵架。Don't play ball games in the classroom.在教室里不要玩球。Don't talk londly in the classroom.在教室里不要大声说话。Don't throw litter about in the classroom. 在教室里不要乱扔垃圾。----也可以把in the classroom（在教室里）改为in class（在课堂上）。另：在课堂上不戴帽子是一些学校的规定，因为会影响后面同学的视线。
极夜北极光
